All the real world parameters such as temperature, pressure etc., are analog in nature, In order to control these physical parameters using computers, which are digital in nature, high speed signal processing board is used. This mainly consists of devices such as analog to digital converter, digital to analog converters and timer which perform the interfacing function between analog and digital...

Digital to analog converters are crucial components in many communication and signal processing systems. Video DAC is used in RAMDAC circuit, used to convert the digital signal to analog signal for the video and pictures to be displayed on a display unit. This kind of video DAC is used in high resolution display for computer graphics and HDTV's. The goal of this project was to design a high spe...

In this article, we aim to design highly energy efficient end-to-end communication for millimeter wave multiple-input multiple-output systems. This is done by jointly optimizing the digital-to-analog converter (DAC)/analog-to-digital (ADC) bit resolutions and hybrid beamforming matrices. The novel decomposition of precoder combiner three parts introduced at transmitter (TX) receiver (RX), respe...

The implementation of OFDM transmitters typically consists of a discrete DFT matrix and a digital-to-analog (DAC) converter. Many existing results on the analysis of OFDM systems, e.g., spectral roll-off, are based on a convenient analog representation. In this paper, we show that the analog representation and the DFT-based OFDM transmitters are equivalent only in special cases. Using the analo...

This paper proposes a continuous-time bandpass ∆ΣAD modulator architecture which performs high-accuracy AD conversion of high frequency analog signals and can be used for next-generation radio systems. We use an RF DAC inside the modulator to enable subsampling and also to make the SNDR of the continuous-time modulator insensitive to DAC sampling clock jitter. We have confirmed that this is the...

The ADF7020 and ADF7020-1 provide access to the FSK demodulator output to facilitate external measurement of functions such as demodulator output SNR, receiver eyediagram analysis, and analog FM demodulation. For these measurements, access to the digital FSK demodulator output is achieved by using an on-chip ΣΔ (SD) modulator in conjunction with an external, passive RC network. This network pro...

This article explores the analog integration challenges in 4G base stations. Rel-12 features, such as wideband downlink CA, downlink multiple-input multiple-out (MIMO) spatial multiplexing, and AAS with embedded RF, present new design challenges in next-generation eNodeB radios. A bits-to-RF solution can help engineers shape alternative radio transmitter architectures (an example is given). The...

The following discussion examines an overlooked option for many existing A/D converter applications: the A/D conversion is sometimes better implemented with a discrete comparator and D/A converter. This substitution generally entails a different measurement approach, but the advantages can include lower cost, higher speed, more flexibility, and lower power consumption. Current trends, though, a...

A 10-bit 140MS/s digital-to-analog converter (DAC) with improved current mirror is presented. In order to improve the resolusion of a 10-bit DAC, a segmented decoding plus R-2R architecture will be introduced. DAC system modeling shows that the dynamic performance of the DAC is strongly dependent on the output impedance of DAC current source. The gain-boosting technique is applied to increase t...